They’ve been doing that during Lent at some parishes around Pittsburgh, and the experiment has been well-received, according to the Pittsburgh Catholic newspaper:

In what was billed as “pulpit sharing” or “priest swap,” the priests from five parishes in two South Pittsburgh neighborhoods visited nearby parishes to celebrate weekend Masses during the first weeks of Lent.

Father Jim Bachner, pastor of St. Catherine of Siena Parish in Beechview, said the reason for the exchange was twofold.

“It’s for us priests to try to get to know each other’s parishes and people in the parishes,” Father Bachner said. “That’s first and foremost. And for the people to get to know us so that we’re familiar with each other. The other purpose was because we’re trying to do more things as a cluster.”

In addition to St. Catherine, the other parishes involved were St. Pamphilus in Beechview, and Our Lady of Loreto, Resurrection and St. Pius X, all in Brookline.

“St. Pamphilus just had a parish mission,” Father Bachner said. “When we’re doing parish missions, we’re trying to do that more and more as a cluster, inviting all the cluster parishes to attend that mission together. Not to say, ‘It’s only St. Pamphilus who’s attending this thing.’ We want to try to include everybody to be able to attend those things.

“I feel if the priests are willing to go to these other parishes as well, that we should hopefully set an example for the parishioners to say, ‘It’s not so bad going to these other parishes.’ We should feel comfortable in other parishes as well, that we’re one community in a sense trying to work more together as a larger community.”

Check out the link for more details about how the arrangement worked.